Power actuated dump wagon



Dec. 3, 1935. J H 2,023,233

POWER ACTUATED DUMP WAGON Filed March 10, 1930 12 Sheets-Sheet 1 Kfive/I352? Joacpb Maia)" Dec. 3, 1935. J. KUCHAR I POWER ACTUATED DUMPWAGON Filed March 10, 1930 l2 Sheets-Sheet 2 3 I Way! 1935. J. KUCHARPOWER ACTUATED DUMP WAGON 12 Sheets-Sheet 3 Filed March 10, 1930 W 0 J mg WEE:

Dec. 3, 1935.

J. KUCHAR POWER ACTUATED DUMP WAGON Filed March 10, 1930 l2 Sheets-Sheet4 H U h l2 Sheets-Sheet 5 Filed March 10, 19150 ll I'll Ill-Il 3,.1935.. J. KUCHAR POWER ACTUA'IED DUMP WAGON Filed March 10, 1930 12 ShGtS-ShGGt 6 R A H C U K J POWER ACTUATED DUMP WAGON Filed March 10, 193012 Sheets-Sheet 7 Dec. 3, 1935. J KUCHAR 2,023,233

' POWER ACTUATED DUMP WAGON Filed March 10, 1930 12 Sheets-Sheet 8five/7227? 10.56 05 jflldiar Hi a Q w Dec. 3,, 1935. J F; 2,Q23,233

POWER ACTUATED DUMP WAGON Filed March 10, 1930 12 Sheets-Sheet 9 jg Z264dasj a /f Jf/Jiar wQ/J' W. 3, 1935. J. KUCHAR 2,023,233

POWER ACTUATED DUMP WAGON WWJM.

Dec. 3, 1935.

J KUCHAR 2,023,233

POWER ACTUATED DUMP WAGON Filed March 10, 1930 12 Sheets-Sheet ll @ec.3, 1935 J. KUCHAF! 2,023,233

POWER ACTUATED DUMP WAGON FiledMarch 10* 1930 12 Sheets-Sheet 1.2

Patented Dec. 3, 1935 rowan nc-rua'rnn num- WAGON Joseph Kuchar,Chicago, 111., assignor'to Athey Truss swheel 00., Chicago, 111., acorporation of Illino Application March 10, 1930, Serial No. 434,577

18 Claim].

This invention relates to dump wagons and more particularly to a. poweroperated dump wagon in combination with a power actuated operatingmeans. 4

An object of this invention is the provision of a dump wagon which maybe actuated either to dump or recondition the wagon for loading, bypower from the tractor, and including control means accessible to thetractor driver whereby power may be selectively applied to perform theoperation desired without the necessity of the driver leaving thetractor seat or stopping the tractor.

A further object is the provision of a trailer combined and associatedwitha tractor including a fluid pressure creating mechanism on thetractor driven by power from the tractor and having fluid pressure meansleading to cylinders on the trailer whereby the actuation of doors onthe trailer may be controlled from the tractor for dumping a load fromthe trailer.

Other objects and advantages will become apparent from the followingdescription.

In the accompanying drawings,

tractor attached to a trailer, the front end only of the latter beingshown, and incorporating my invention; Figure 1A is a side elevation ofthe main portion of the trailer, the front end of which is shown inFigure 1;

Figure 2 is a side elevation of the power takeoff from the tractor andthe air compressor mounted on the front end of the tractor showing alsothe bracket arrangement for supporting an attached generator;

Figure 3 is a front elevation of that shown in Figure 2;

Figure 4 is a diagrammatic perspective of the doors and operatingmechanism on the trailer for illustrating the manner of operation;

Figure 5 is a fragmentary perspective of a portion of the trippingmechanism further illustrated in Figure 8;

through one of the operating cylinders;

Figure 7 is a plan view taken substantially on Figure 1 is a fragmentaryside elevation of a Figure 6 is an enlarged horizontal section Figure 11is a side elevation of a fragment of a tractor coupled with a trailerincorporating a modification of my invention and showing the powertakeoff and fluid transmitting conduits from the tractor to the trailer;

Figure 11A is a side elevation of the main portion of the trailer, thefront end of which is shown in Figure 11;

Figure 12 is a horizontalsection through the cylinder shown on the sideof the dump wagon in 10 Figure 11A;

Figure 13 is a rear elevation of the power takeoif,,pump, and fluidreservoir mounted on the rear end of the tractor;

Figure 14 is a vertical section taken through 15 the pump 'on the linell-ll of Figure 16;

Figure 15 is: a cross section taken through one of the controllingvalves;

Figure 16 is a vertical section taken on the linev I i6l6 of Figure 13;and

Figure 17 is a horizontal section showing the clutch control, and takenon the line II-ll of Figure 16.

Referring first to Figures 1 to '1 inclusive, a dump wagon designated asa whole by numeral 26 3 is shown, which consists of a frame includinghorizontal spaced side channels 4 to which are secured verticalanglebars 5 which support the sheet steel side members 8 of the body.The .upperedge of the body is reinforced by longitudi- 30 nallyextending bars 'I and 8 to which are secured adjacent the front end,horizontally exthe line l-'| of Figure 8 and showing some of the partsin section;

Figure 8 is a vertical section taken on the line 88ofFigure7;

Figure 9 is a longitudinal section taken on the line 99 of Figure 10;

ofFigure9;

e 10 is a section iken on til? 89 ll-ll through which are'fltted shaftsIll and II.

tending brackets '0 provided with openilngs tween the side frames 4 aredisposed two pairs of bottom dump doors I! and II at the front-and rearof the body respectively and being sufflciently spaced to provideclearance for the necessary chains and pulleys which operate the same,and

which will be hereinafter further described. The 40 doors I! and I8 areprovided with hinge elements ll having openings l5 therein through whichpass cooperating hinge elements It secured to the frame 4 by rivets IIas shownin Figure 1A.

The shape of the hinges consisting of elements H and It is such thatwhen the doors I: or I! 1 swing downwardly, the hinged edges of thedoors move laterally so as to completely clear the opening in which thedoor snugly fits when in closed position. This arrangement permitstheload of gravel, stone or the like which may be supported by thedoors, to fall clear of the trailer without the necessity of scraping orcleaning around the edges of the door, and more particularly so thatthe'doors may again be closed without interefer-lii ence from materialsbeing caught between the hinged edges of the doors and the frame towhich the doors are hinged.

The free edges of doors |2 are supported by chains l8 and I9, the rearends of which are coupled to the rear end of chain 2| by the tri-.angular plate 22. The front ends of chains |8 and I9 are fixed togrooved drums 23 and 24 respectively, which are in turn fixed forrotation with the shaft The front end of chain 2| is similarly fixed toa grooved drum 25 on the shaft When the shaft I rotates in a clockwisedirection as viewed in Figure 4, the forward ends of chains |8, l9, and2| are wound on their'respective drums, and since the free edges of thedoors |2 are supported by a portion of the chains |8 and I9, therotation of the shaft II in a clockwise direction causes the doors to beforced to a closed position. The rear ends of chains I8 and |9 pass oversheaves 26 and 21 respectively, which are fixed for rotation with shafts28 and 29 respectively for the purpose of guiding the chains l8 and I9and preventing excessive friction. The rear end of chain 2| passes overa similar rotatably mounted sheave 3| for guiding it throughout itsrange of movement. A cylinder 32, which is mounted on the side of thebody, accommodates a piston having a piston rod 33 extending therefromand connected with a chain 34, the forward end of which is fixed to thegrooved drum 25 such that it is unwound from the drum when the drummoves in a clockwise direction and is wound to the drum when moved inthe opposite direction.

As will be clearly seen from Figure 4, the doors are closed by means offluid pressure being applied to the forward side of the piston in thecylinder 32, which causes the shaft II to rotate in a clockwisedirection and raises the doors in the manner above explained.

The doors |3 are similarly supported by chains 34 and 35, the ends ofwhich are secured to chains 36 and 31 by means of triangular couplingplates 39. These chains'pass over sheaves 4|, 42, 43 and which guide thesame through their range of movement and facilitate the lifting of thedoors. Chains 36 and 31 also pass over sheaves 45 and 46 respectivelyand have their forward ends coupled to a chain 41 by means of atriangular plate 48. The chain 41 is fixed to a grooved drum 49 which isfixed for rotation with the shaft ll). Also fixed to the grooved drum 49is a chain 5| having its rear end attached to a piston rod 52 extendingfrom cylinder 53 which accommodates a piston on the end of the pistonrod 52, the detail construction of which is illustrated in enlargedsectional views hereinafter more specifically described. Theclosing ofthe rear doors I3 is effected by applying force to the forwardside ofthe piston in cylinder 53, which causes the drum 49 to rotate in aclockwise direction as viewed in Figure 4 and which winds chain 41thereon and lifts vertically on the chains 34 and 35 supporting doorsl3.

In Figure 7 the mounting of shafts I8 and in journal brackets 54 and 55fixed to the front end of the body 3 is clearly shown.

For the purpose of holding the doors in any desired position I haveprovided the shafts 0 and with ratchet wheels 56 which are fixed thereonby keys 51. a A housing 58 encloses the ratchet wheels 56 and isjournaled at 59 and 69 on the adjacent ends of shafts l0 and II foroscillatory movement thereon. The housing 58 carries a shaft 62 on whichis mounted two pawls 63 adapted to engage the ratchet wheels 56 whenmoved toward the ratchet wheels by the rods 64 and 65 which passlongitudinally through the hand lever 66 and are guided in theirmovement by a sleeve 61 fitted within the lever 66 as shown in Figure 9.Springs 68, the ends of which are secured to the pawls 63 and thehousing 58 respectively, normally hold the pawls out of engagement withthe wheels 56, but the springs 68 are adapted to yield when pressure isapplied through the medium of the rods 64 and 65 by means of the handgrip 69 which is pivoted to a U-shaped collar H by means of a bolt 12 asshown in Figures 9 and 10. A shiftable contact member 13 is pivoted to aportion of the hand grip 69 by a bolt 14 and is adapted to be shifted asshown in Figure 10 such that the inner end may engage the end of rod 84or the ends of rods 64 and 65 at the same time for causing either bothof the pawls 63 or only the one attached to rod 64 to engage theirrespective ratchet wheels 56 for causing the same to be rotated in aclockwise direction upon oscillation of the lever 66. The ratchet wheels56 are normally engaged by dogs 18 which are pivoted between the forkedends 79 and 80 of a trip lever 8| and between forked ends 82 and 83 of atrip arm 84 and on a shaft 85. The trip arms 8| and 84 are journaled onthe shaft 86 and are normally held in the position shown in Figure 8 bymeans of a relatively stiff tension spring 81, the ends of which areconnected to the lower extension 88 on the lever 84 and to an eye bolt89 passing through laterally extending reinforcing bars 9|, 92, and 93.

The lower ends of thedogs 18 are provided with stop members 94whichengage portions of the trip levers 8| and 84 to prevent the upperends of the dogs from falling away from the ratchet wheels. Brackets 55are provided with vertically depending web portions or plates 96 onwhich are formed integral stop" members 91 which engage the forkedportions of the levers 8| and 84 and limit their movement in a clockwisedirection about the shaft 86. The arrangement is such that when theupper ends of trip levers 8| and 84 or either of them are pushedrearwardly, the stop 94 on the lower end of dog 18 leaves contact withits respective arm 8| or 84 as the case may be, and the dog 18oscillates in a clockwise direction on the shaft 85, causing the same tobecome disengaged from the ratchet wheel 56 permitting the shaft H] 'orII, as the case may be, to-

be rotated in a counter clockwise direction by means of the chainssupporting the doors l2 and l3 and thereby dumping the load which may besupported by the doors.

The operation as above described may be modified in case the trip arm 84is operated instead of the arm 8|, since, as will be seen in Figure 5, alug |8| on the forked portion 82 engages a lug I92 on the forked portion80 of the lever-8| such that when the lever 84 is oscillated about itspivot 86 in a counter clockwise direction the lugs IM and I92 engage andthe lever 8| is also forced to move in a counter clockwise direction forreleasing both of the dogs 18 instead of only the one attached to thelever 84. The purpose of this arrangement is to avoid dumping of thedoors in thv front end of the trailer without dumping thr doors in therear end since if the doors in the front end were dumped while a loadremained on! the doors in the rear end, the trailer might be i comeoverbalanced. The arrangement as de scribed, however, is such that therear doors ma be dumped without dumping the front doors, since thereisno danger of overbalancing the trailer forwardly on account of a supportat the extreme forward end of the trailer- If it is desired to dump therear doors, this may be accomplished by operating the trip arm 8|manually, but if the rear doors and front doors are to-beoperated-simultaneously, this may be accomplished by means of the pistonrod I which is coupled at I06 to the depending portion 88 of the arm 84.The piston rod I05 may be forced forwardly into the cylinder I01 byadmitting fluid under pressure through the conduit I03 which causes thepiston on the forward end of the piston rod I05 to draw the rodforwardly and operate the trip lever 84 and indirectly operate the triplever 8| through the medium of the engaging lugs IM and I02 shown inFigure 5.

The cylinder I01 is pivotally mounted to the frame 4 by means of a boltI03 and a bracket IIO fixed to the frame 4 by suitable rivets III asshowninFigures7and 8. I

Referring again to Figures '9 and 10, the shifting handle, H2 isyieldingly held in either the position shown in full lines or theposition shown in dotted lines by means of a yieldingly held ball II3enB -ng in an aperture H4 in the shift lever II2. A spring H5 isinterposed between the ball H3 and a set screw II6 which is threaded ina portion of the hand grip 63.

Referring now to Figure 6,- which is an enlarged section showing morepartlcularlycthe details of construction of the cylinders used foroperating the drums 25 and 49 and for operating the trip lever 64. Sincethe cylinders are substantially identical inside, only one will bedescribed which I have designated as a whole as cylinder 32. One end ofthe cylinder32 is fixed to one of the vertical angle bars 5 by means ofbrackets I20 through which passes-a pin I22 which also passes throughcylindrical apertures I23 in rearwardly extending lugs I24 integral withthe head' I25 of the cylinder. The head I25 is provided with an annularstop I26, which is adapted to engage a metal cup I21 forming the rearside of the piston. The cup I28 of leather, rubber or similar materialengages the forward side of the cup l 21and is held in place by a metaldisc I23 all of which are fitted on a reduced portion I30 on the rearend of the piston rod 33 and held in place by a nut I3I. The perimeterof the cup I23 frictionally engages the inner surface I32 of thecylinder wall I33 for preventing. the escape of pressure fluid from thefront end of the cylinder to the rear end. The piston rod 33 passesthrough a suitable packing gland I34 which is adapted to be lubricatedthrough suitable fittings I35 and I36. The heads I25 and I31 of thecylinder are held from relative longitudinal movement by bolts I38 inany suitable manner as shown in Figure 6.

Fluid under pressure may be forced into the cylinder through theport I38from the conduit I39 which receives air under pressure from the pump I4lpositioned on the front end of the tractor I42 illustrated in Figure 1.As the cylinders 53,'32,and I01 accommodate pistons and piston rods ofsimilar construction, it is thought to be unnecessary to describe eachin detail.

In Figures 1 and 2 is shown the air compressor 1, which may be of 'anyconventional type the details of which are not a part of this inventionand will not be described. The compressor shaft I43 is driven by a gearI44 which meshes with a similar gear I45 journaled on a shaft I46 in abracket I41 and extends through an aperture I48 in the motor housing I49of the tractor and meshes with a gear I 5I from which it receives powerof operation from the tractor motor. The compressor MI is mounted on abracket I53 by 5 means of bolts I54. One end of the bracket I53 isadapted to have secured thereon a bracket I55 by means of bolts I58 andI51, which bracket is adapted to hold a generator I58 which may beconnected to the compressor shaft I43 by a coupler I53. 'The generatorI58 may be omitted without detracting from the utility of my inventionand when used it is employed in the same way that generators areordinarily employed on tractors'or other motor vehicles.

An air pressure conduit I6I leading from the compressor I4I passes to anair tank' I62 on the rear end of the tractor. Air under pressure maypass, either from the compressor directly or from the tank I62 or both,through a conduit I63 to a valve I64, which may be of any conventionaldesign such that by the operation ofthe control lever I65, .air underpressure is admitted to the conduit I66 or to conduit I61 as may bedesired,

but not to both conduits at the same time.

- The conduit I66 through the medium of suitable couplings is connectedto the conduit I03 leading to the cylinder I01 which is adapted tooperate the tripping-mechanism. 'Ii ie conduit I 61 is connected to theconduits! leading to the cylinders 32 and 53 which are adapted'to closethe doors I2 and I3 respectivelyupon receiving air pressure from theconduit.

Referring now to Figures 11 to 11 inclusive which disclose amodification of my invention,

the trailer 3 is substantially identical to that shown in Figures 1 and1A. The doors I2 and I3 are-of similar construction and operated in likemanner. This modification illustrates the adaptation of my invention tooperation by hydraulic pressure instead of air pressure and. I havetherefore illustrated a hydraulic cylinder 32' used in the place of theair cylinder 32 she in Figure 1A.

For. operating the trip lever 84 I have employed a hydraulic cylinderI01 in place of the air cylinder I01 shown in Figure 1. Since in thismodification, as in the one previously described, all the cylinders areof a very similar construction, only the cylinder 32' shown in Figure 12will be dev scribed. 1 v The cylinder heads I25 and I 31', are held fromrelative longitudinal movement by bolts I33. The cylinder is fixed tothe" body of the trailer by means of brackets I20 in the manner shown inFigure 6. The piston rod 33' is providedwith a piston consisting of aplurality of disc members I63 and I63, the perimeters 'of which havefrictional engagement with the, inner surface I32 of the cylinder wal1I33'. An inlet conduit I1I'leads W to the port I12'at the front end .301the cylinder. and anioutlet conduit I13 leads from a port I14 adjacentthe rear end of the cylinder. The port I14 has an elongated-portion I15which permits the escape of liquid which might become entrapped beyondthe piston when. the piston is in the position shown in Figure 12.

Upon admission of liquid to the cylinder 32', the piston rod is forcedtoward the rear until the forward edge of the port I14 is uncovered,per- 70 mitting the liquid under pressure to by-pass outwardly throughthe return conduit I13 and back to the pump.

The pump and clutch mechanism which controls the operation of thepistons in the respective cylinders is shown in Figure 16. A reservoirI18 is mounted on brackets I19 fixed on the rear end of the tractoradjacent the position normally occupied by the tractor driver. The pumpI8I comprises two cooperating gears I82 shown in Figure 14, which drawfluid from the reservoir through the pipe line I84 downwardly throughport I85, passageway I86 and outwardly through passageway I81 to thepressure conduit I88 shown in Figure 11. The conduit I88 leads to avalve I89, which has an inlet port I9I and two outlet ports I92 and I93through either of which fluid may be directed by means of the valveelement I94 having a passageway I95 therethrough, and which is adaptedto be oscillated-by means of a vertical rod I96 having on its upper endan operating handle I91, into either the position shown in Fig. 15 orinto a position in which the inlet I9I is connected to the outlet I93.

The passageway I92 connects with a conduit I98 which through the mediumof suitable couplings leads to the inlet conduit I99 of the cylinderI81. The passageway I93 empties into the conduit 20I, which through themedium of suitable couplings leads to'the inlet conduits I1I of thecylinders 32' which are adapted to close the doors. The return lines I13and 205 from the respective cylinders are joined by means of a suitablefitting 206 and through the medium of suitable couplings connect with aconduit 201 which communicates with the suction port I85 of the pump asshown in Figure 14.

Since it is not desirable to have the pump I8I operating constantly Ihave provided a clutch consisting of cooperating clutch elements 208 and209 which connect the shaft 2| with the tractor shaft 2II through themedium of a coupler 2I2 and a stud shaft 2I3 which is journaled inbearings 2 I4 mounted on the main pump bracket 2| (see Figure 16). Theclutch lever 2I6 is fixed to a portion 2I1 fixed to a shaft 2I8 which isjournaled in the upper portion 2I9 of the bracket 2I5. A gear segment22I is fixed to the shaft 2I8 by a pin 222 and intermeshes with a pinion223 on one end of a valve shaft 224 on the other end of which is fixed avalve element 225 which may be shifted from the full line position shownin Figure 14 to either of the dotted line positions therein illustratedby oscillation of the gear segment 22I. The gear segment 22I-isoscillated by oscillation of the clutch lever 2I6 since they are bothfixed to the same shaft 2I8.

Referring now to Figure 17, an adjustable set screw 221 engages a camsurface 228 on a fixed bracket 229 and is normally held in engagement bymeans of a coil spring 23I on the shaft 2I8. When the clutch lever ismoved suificiently downwardly as viewed in Figure 17, the set screw 221will engage the cam surface 228 at the point 233 which permits thespring 23I to move the clutch lever together with the shaft 228 to theleft as shown in Figure 16. As the clutch lever moves tothe left, thespaced depending lugs 234 and 235 confine the upper end of the bellcrank arm 236 which is pivoted on a shaft 231, and move the upper end ofsaid arm 236 to the left,

causing the lower end 238 to move to the right taking with it the clutchelement 209, thereby disengaging the clutch and permitting the pump tocease operation.

When the clutch is in its disengaged position as shown in Figure 16, thevalve element 225 is in its full line position as shown in Figure 14.When the clutch is first engaged such that the lever 2I6 is in theposition shown in Figure 17,

the pump is operating and. the valve element 228 assumes the horizontaldotted line position shown in Figure 14. In this position fluid passesthrough the pump and by-passes back through the valve and through thepump again without creating a pressure and without drawing fluid fromthe intake. When the clutch lever is moved further upwardly as viewed inFigure 17, the valve element assumes the position shown by the verticaldotted line in Figure 14, which prevents the by-passing of the fluidthrough the pump and permits fluid to come in through passageway I85,through passageway I86, through the pump, and outwardly throughpassageway I81 to the cylinders and the position of the valve I89determines whether the fiuid under pressure is being directed to thetripping lever 84 to open the doors, or to the cylinders 32' for closingthe doors.

The trailer illustrated in the drawings is suitably coupled to thetractor through the medium of a draw bar 24I and coupling means 242. Thefront end of the trailer is preferably supported by a set of wheelsindicated diagrammatically by the circle 243. The main weight of thetrailer is supported by suitable wheels provided with track layingelements indicated diagrammatically at 244 and 245 respectively. It,will be apparent that other means for supporting the weight of thetrailer may be used without departing from 'body, door'closing means onsaid body, power operated means for actuating said closing means toclose said doors, holding means for said door actuating means, poweroperated means for releasing said holding means, and means forselectively transmitting power to each of said power operated means.

2. In a dump wagon, a frame, a load carrying bed fixed to said frame,bottom dump doors in said bed, fluid pressure operated pistons operablyconnected with said doors for closing the same, means for controllablysupplying fiuid under pressure for actuating said pistons, means forholding said doors in closed position, and power operated means forcontrollably releasing said holding means.

3. In a dump wagon, a frame, a load carrying bed fixed to said frame,bottom dump doors in said bed, cylinders fixed to said frame, fluid pressure actuated pistons in said cylinders operably connected with saiddoors for closing the same, means for controllably supplying fluid underpressure to said cylinders, means for holding said doors in closedposition, and power operated means for controllably releasing saidholding means.

4. In a dump wagon, a frame, a load carrying bed fixed to said frame,bottom dump doors in said bed, a fluid pressure cylinder fixed to saidframe, a piston in said cylinder operably connected with said doors andadapted to close said doors upon actuation by fluid pressure in saidcylinder, a pawl and ratchet mechanism adapted to hold said doors inclosed position, power operated releasing mechanism for said holdingmeans comprising a aozaass second cylinder and piston, said secondpiston being connected with and adapted to trip said pawl and ratchetmechanism to permit said doors to open by gravity, and means forcontrollably and selectively supplying fluid under pressure to saidcylinders.

5. The combination of a'dump wagon with a tractor for conveying thesame, said dump wagon comprising a frame, a load carrying bed fixed tosaid frame, bottom dump doors for said bed, power operated mechanism onsaid frame operably connected with said doors for closing the same,means releasably holding said doors in closed position, other poweroperated means on said frame adapted to release said holding means andpower mechanism on said tractor for supplying and transmitting power toactuate both of said power operated means.

6. The combination of a dump wagon with a tractor for conveying thesame, said dump wagon comprising a frame, a load carrying bed fixed tosaidframe, bottom dump doors for said bed, power operated mechanism onsaid frame operably connected with said doors for closing the same, pawland ratchet mechanism on said dump wagdn operably connected with saiddoors for releasably holding them in closed position, power oper atedmeans for controllably releasing said holding mechanism, and powermechanism on the tractor adapted to supply power to said power operatedmeans. Y

'7. The combination of a dump wagon with a tractor for conveying thesame, said dump wagon comprising a frame, a load carrying-bed fixed tosaid frame, bottom dump doors in said bed hinged to said frame to opendownwardly by gravity, a fluid pressure cylinderon said wagon, a pistonin said cylinder, means operably connecting said piston to said doorsfor. closing the same, said connecting means including a shaft, aratchet wheel on said shaft, 9, dog releasably engaging said ratchetwheel for holding said doors in closed position, power operatedmechanism actuated by fluid pressure for releasing said dog, and meanson the tractor controllably and selectively supplying fluid underpressure to said cylinder and to said power operated means.

8. The combination of a dump wagon with a tractor for conveying thesame, said dump wagon comprising a frame, a load carrying bed fixed tosaid frame, bottom dump doors in said bed hinged to said frame to opendownwardly by gravity, 9. fluid pressure cylinder on said wagon, apiston in said cylinder, means operably connecting said piston to saiddoors for closing the same, said connecting means including a shaft, aratchet wheel on said shaft, a dog releasably engaging said ratchetwheel for holding said doors in closed position, power operatedmechanism actuated by fluid pressure for releasing said dog, a fluidpump on said tractor driven by power therefrom, conduits leading fromsaid pump to said cylinder and to said power operated mecha nism, andmeans on the tractor for. selectively shutting off the supply of fluidto either of said conduits.

9. The combination of a dump wagon with a tractor for conveying thesame, said dump wagon comprising a frame, a load carrying bed fixed tosaid'frame, bottom dump doors in said bed hinged to said frame to opendownwardly by gravity, 9. fluid pressure cylinder on said wagon, apiston in said cylinder, means operably connecting said piston to saiddoors for closing the same, said connecting means including a shaft, aratchet wheel on said shaft, a dog releasably engaging said ratchetwheel for holding said doors in closed position, power operatedmechanism actuated by fluid pressure for releasing said dog, a fluidpump on said tractor driven by power there- 5 from, conduits leadingfrom said pump to said cylinder and to said power operated mechanism,means for selectively shutting off the supply of fluid to either of saidconduits, and means on the tractor for controlling the operation of saidpump.

1 10. The combination of a bottom dump wagon with a tractor, said wagoncomprising a body, a pair of cooperating dump doors hinged to said bodyto open downwardly by gravity, a fluid actuated piston operablyconnected to said doors for closing the same, meansreleasably holdingsaid doors in closed position, including a transversely extending shafton said body operably connected to said doors, a ratchet wheel on saidshaft, a dog engaging said ratchet wheel, a fluid actug ated pistonoperably connected with said dog for disengaging the same from saidratchet wheel, and means on said tractor for supplying fluid underpressure to said pistons.

11. The combination of a bottom dump wagon with a tractor, said wagoncomprising a body, apair of cooperating dump doors hinged to said bodyto opendownwardly by gravity, a fluid actuated piston operably connectedto said doors for closing the same, means releasably holding said doorsin closed pmition, including a transversely extending shaft on said bodyoperably connected to said doors, a ratchet wheel on said shaft, a dogengaging said ratchet .wheel, a fluid actuated piston operably connectedwith said dog for disengaging the same from said ratchet wheel, fluidpressure creating mechanism on said tractor actuated by power from saidtractor,. and means for transmitting fluid under pressure from saidmechanism to said pistons. 40

12. The combination of a bottom dump wagon with a tractor, said wagoncomprising a .body, a pair of cooperating dump doors hinged to said bodyto open downwardly by gravity, a fluid actuated piston operablyconnected to said doors for closing the same, means releasably holdingsaid doors in closed position, including a transversely extendingshaft-on said body'operably connected to said doors, a ratchet wheel onsaid shaft, a dog engaging said ratchet wheel, 'a fluid actuated pistonoperably connected with said dog for disengaging said ratchet wheel, afluid pressure creating mechanism on said tractor actuated by power fromsaid tractor, a discharge conduit leading from said mechanism, a control5 valve at one end of said conduit, distributing conduits leading fromsaid valve and adapted to transmit fluid to each of saidpistons, saidvalve including a valve element for selectively diverting fluid fromsaid discharge conduit to either of said distribution conduits.

- 13. In combination a tractor, a wagon hitched thereto and providedwith gates adapted to open, a hydraulic cylinder on the wagon adapted toclose the gates, a pump on the tractor adapted to supply pressure fluidto said cylinder, and a valve on the tractor adapted to control thesupply of said pressure fluid.

- 14. In combination a tractor, a wagon hitched theretohaving gatesadapted to open, a cylinder adapted to close said gates, means adaptedto maintain said gates closed, a cylinder adapted to release said means,a pump on the tractor adapted to supply pressure fluid to saidcylinders, and a valve onthetractor adapted to conv7 trol the supply 0!pressure fluid selectively to said cylinders to open and close thegates.

15. In combination a tractor, a fluid compressor thereon, a wagon havingdoors adapted to open under the action of the load, a cylinder on thewagon adapted to close said doors, and a flexible conduit between thecompressor on the tractor and the cylinder on the wagon whereby pressurefluid may be supplied to said cylinder.

16. In combination a tractor having a fluid compressor thereon, a wagonhaving gates adapted to open, a cylinder in said wagon adapted to closesaid gates, a cylinder on said wagon controlling the opening of saidgates, flexible conduits between the cylinders on the wagon and thecompressor on the tractor, and a valve on said tractor adapted tocontrol the supply of pressure fluid from the compressor selectively tosaid cylinders.

17. In combination, a tractor, a trailer with a dumping door thereon, apump on the tractor, hydraulic means on the trailer connected to saidpump and adapted to close said dumping door, and a valve on the tractorwhereby pressure fluid may be enclosed in said hydraulic means.

18. In combination, a tractor, a trailer with a dumping door thereon, apump on the tractor, a hydraulic cylinder on the trailer adapted toclose said dumping door, a conduit for fluid extending between said pumpand cylinder, and a valve on the tractor controlling said conduitwhereby fluid under pressure may be enclosed in said hydraulic cylinder.

JOSEPH KUCHAR.

